The head of the NHS faced further calls to quit last night after he admitted
giving incorrect information to a parliamentary committee.

Sir David Nicholson has written to the Public Accounts Committee to say that
he was wrong to deny repeatedly that Gary Walker, then head of United
Lincolnshire Hospitals, had told him that he wanted to be a whistleblower
about patient safety in 2009.

Mr Walker, who was sacked in 2010, told the health select committee yesterday
of “a culture of threats and intimidation” in the NHS, which his former
chairman David Bowles likened to the mafia. Problems began,